Schuster Lab
Quantizing computers one circuit at a time.
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WelcomeQuantum Information Processing (QIP) promises nothing less than an entirely new paradigm of computation, employing quantum superposition and entanglement to exponentially speed up certain types of computation (factoring and other important cryptographic algorithms) while dramatically speeding up others (unstructured database searching). QIP presents similarly daunting challenges, with competing requirements of fast manipulation, long storage, and long distance transport of fragile quantum states. David Schuster, Greg Engel, and WIlliam Irvine were selected as Sloan FellowsThree professors from University of Chicago and the James Franck Institute faculty were selected as Sloan fellows.
Professor Schuster wins NSF CAREER AwardProfessor Schuster receives NSF CAREER Award to study Hybrid Quantum systems using circuit quantum electrodynamics. Observation of High Coherence in Josephson Junction Qubits Measured in a Three-Dimensional Circuit QED Architecture
Superconducting quantum circuits based on Josephson junctions have made rapid progress in demonstrating quantum behavior and scalability. However, the future prospects ultimately depend upon the intrinsic coherence of Josephson junctions, and whether superconducting qubits can be adequately isolated from their environment. We introduce a new architecture for superconducting quantum circuits employing a three dimensional resonator that suppresses qubit decoherence while maintaining sufficient coupling to the control signal. Professor Schuster wins McMillan Award!
Professor Schuster was awarded the 2011 McMillan Award for pioneering contributions to the new field of "circuit quantum electrodynamics", particularly experiments coupling microwaves to spin ensembles and to superconducting qubits. The Department of Physics at the University of Illinois at Urbana-Champaign established the William L. McMillan Award in 1986 to commemorate and honor the memory of Bill McMillan a gifted theoretical and experimental condensed matter physicst. The award is for outstanding contributions by a young researcher in condensed matter physics, broadly construed. In the spirit of Bill McMillan’s own research, the award recognizes outstanding achievements of young condensed matter physicist in theory, experiment, or both. Professor Schuster receives DARPA Young Faculty Award
The DARPA Young Faculty Award (YFA) program identifies and engages rising research stars in junior faculty positions at U.S. academic institutions and introduces them to DoD needs and DARPA’s program development process. The YFA program provides funding, mentoring, and industry and Defense contacts to promising faculty early in their careers to help develop their research ideas in the context of Defense needs. By enabling early engagement with the "best and the brightest" young faculty in core technology areas of interest to DARPA, the YFA program helps equip the next generation of academic scientists, engineers, and mathematicians for research on Defense and National Security issues. Cavity QED in a molecular ion trap
We propose a class of experiments using rotational states of dipolar molecular ions trapped near an on-chip superconducting microwave cavity. Molecular ions have several advantages over neutral molecules for such cavity quantum electrodynamics experiments. In particular, ions can be loaded easily into deep rf traps and are held independent of their internal state. An analysis of the detection efficiency for, and coherence properties of, the molecular ions is presented. QC Featured in the NYTimes!
High cooperativity spins paper featured in Physics and Nature News magazines!
High-fidelity readout in circuit quantum electrodynamics using the jaynes-cummings nonlinearity
We demonstrate a qubit readout scheme that exploits the Jaynes-Cummings nonlinearity of a superconducting cavity coupled to transmon qubits. We find that, in the strongly driven dispersive regime of this system, there is the unexpected onset of a high-transmission “bright” state at a critical power which depends sensitively on the initial qubit state. A simple and robust measurement protocol exploiting this effect achieves a single-shot fidelity of 87% using a conventional sample design and experimental setup, and at least 61% fidelity to joint correlations of three qubits. 
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Featured Publications |
The Alfred P. Sloan Foundation congratulates the winners of the 2012 
The Faculty Early Career Development (CAREER) Program is a National Science Foundation-wide activity that offers the NSF's most prestigious awards in support of junior faculty who exemplify the role of teacher-scholars through outstanding research, excellent education and the integration of education and research within the context of the mission of their organizations.
